Crystal grinding device



April 3, 1945. A. SPINA I CRYSTAL GRINDING DEVICE 2 Sheets-Sheet 1 Filed Jan. 20, 1944 Ti l gi ls J 'INVENTOR. fi fo zyapz'lza BY A I 8 I ATTORIVEY amasse onY'srAL GBINDINGDEVICE I *Anthony spina BrooklynjN Y." 1 mamas-nasty 20, 1944,;Seri'al No. 518,914 l SCIaiin'Sv C 5 ...1f2 5);jf

. i This invention relates to new and. usefultim- I provements in machines for grinding crystals. .1

:..More particularly, the invention. proposesan and holding jaws forengaging'and holding the .The invention also proposes. the provision of.

arms hingedly mounted on said'brackets and pro-v vided with adjustable weights forpressing lsaid crystalsagainst the grinding or polishingwheel: .Foriurther comprehension of the invention, and; of the objects and advantages thereof, referencerwill be had to-the following description andaccompanyin drawings, .andsto the appended claims in which the variouslnovel fea tures of the invention are foi'tln In the accompanyingv drawings Fig. l is a plan view of a crystal grindingm'ae chine constructed tion.: 1

Fig. 2v is a vertical sectional line 22 of Fig. 1.

Fig.3" is a fragmentary enlarged vertical sec-2 tional view taken on .theline 3.-'-3::'of Fig. I.

Fig. 4 is a fragmentary enlarged vertical sectional view taken on the line 4-4 of Fig. 1; 1;

The: crystal grinding machine, according-to:

this invention, includes a container l supported by;legs .ll on a base I2. Theicontainerlllzisopen atthe top. A grinding or polishing wheel..|4n'is. rotatively mounted within the; container I0; and. has aflat top l5. The wheel l4 ismounted upon a vertical shaft It. It is secured to thezshait It by a key H. A nut 18 threadedly engages on the topofthe shaft It. The shaft 16 is'rotatively mounted through a bearingablocklll and T18. ro+-.

tativelysupported i'atthe bottom upona thrust bearing 20. A pulley 2| is mounted on the shaft it by which said shaft may be driven.

The grinding or polishing wheel I4 is supplied with grinding or polishing fluid in the nature Carborundum mud or other fluid. For this purpose there is a vessel 22 supported upon said conmore particularly set iformingia'ma terial part of this disclosure: g

in accordance with thisinven- View. taken on the into-the vessel 22.

against said flat top 15.

tainerlfl byseveral brackets '23. This vessel .22 is-suppor'ted at an inclination sofithat fluid supplied-tozit will drain off at .the point 24 which is located above the grindingiandpolishing wheel l4; A water: faucet water supply25 discharges The vessel 22 may be filled with suitable grinding or polishing. powders which may be turned into m'udby the applicationof waterpfrom the faucet water supply 25. The container;. ll isyprovided withdraining grooves. 28 upon its bottom'and along. its sides. .These drain grooves 26 connectwith a drain pipe21. by. which theiexcess fiuidmay be drained off. 1 ,;The, machine-is also providedtwith a. plurality of means for engaging and holding crystals 34 This means'is in the nature. of a plurality of. brackets 30 removably mounted upon the'walls of the vessel It] by screws or otherfastening elements 3|. Eachbracket 30 extends over a section of thewheel [4. Each bracket 30 has aradially extending side 32. A plurality ofjaws. 33 are adjustably mounted upon these. radial-sides. Each radial side 32 is formed, with a. dovetailed groove 34 into which doyet t led tongues 35 from the jaws 33 engage.

Set'screws 36 are threadedly mounted through certain of a group of threaded openings 3'! .for engaging against the tongues 35 for locking and holding thenjaws 33, as desired.v These jaws 33 are; adapted to engage against the sides of a crystal rested on the'fiat top 15.

;Each:bracket 30 is also provided with a substantially horizontal arm it which is connected by a,,- hinge4l'with a slide 42. slidably mounted in tracks 43 located upon the top face ofthe bracket 30. A screw 44. rotatively engages each slide 32 and threadedly engages a fixedgbracketAiby which-the slide 42 may be adjusted forwards and rearwards in various positions. Each arm 40 is provided with a felt strip 46;;which is adapted to engageand rest upon the topofmthe crystal .38., vEach arm 40 is formed with aplurality of spaced openings 41. A weight I tie-rested on each arm M) and is. provided with a pin 49,,engageable in one of the openings 41 for holding the; weight in selected positions upon the arm. The weightAB is for thepurpose of pressing the crystal 38 against the fiat top l5 of thegrinding or-polishing wheel I4 at a desired pressure.

The operation of the device is as follows:

The wheel M is driven in the direction indicated by the arrow A in Fig. 1. When rotating in this direction the crystals 38 are urged against the brackets 30 and are held from moving lat- Each slide 42 is erally by the jaws 33. The arms 40 may be adjusted so that the hinges 4| are located nearer or farther from the crystals 38 for increasing or decreasing the mechanical advantage of the arms 40 in relation to the crystals 38. The weights 48 may be placed in various positions on the arms 40 and in this way a proper pressure may be obv drain pipe 21. The arms may be pivoted upwards to expose the crystals 38 which may be removed when desired. 1 H

While I have illustrated and described the-pre-- ferred embodiments of my invention, it to be understood that I do not limit myself to the precise constructions herein. disclosed and the right is reserved to all changesand modifications coming within the: scope of theinvention. as defined in the appended claims.

Having thus described my invention, what. I claim as new, .a.nd desire to secure by United States Letters Batent.is;

1. An automatic crystal grinding machine, comprisinga. container, a grinding or polishing wheel having. a. fiat. top and rotatively mounted in. said container, meansfor driving said grinding wheel, meansion supplying grinding or polishing fluid to the top of saidwheel, means for draining. said, fluidf-rom said, container, and a plurality of means for engaging: and holding crystals against said. flat top, each or said latter named means comprising'a bracket mounted on said container and extending over a section of said wheel and. having one. sideextendingradially of said wheel, a pair of jaws ad'justab-ly mountedon said radially extending sidefon engaging the sides of a. crystal rested on said wheel, a substantially horizontal arm hingedly mounted on said bracketand extending over and engaging said crystal, and a weight on said armfior pressing said crystal against said wheel.

2. An automatic crystal grinding machine,- comprising. a. container, a grindingorpolishing;

wheel having a flat top and rotatively mounted in said. container, means for driving said grindingwheel, means for supplying gri-ndingor polishing fluid to the tonof said wheel, means fordraining said fluid from. said container, and a plurality of means for engaging and holding crystals against said fiat top, each of saidlatter namedmeans comprising a bracket. mounted on said container and extending over a section of said wheel. andohaving one side.extendingradially at said Wheel, a pair jaws adjustably. mounted on said radially extending. side for engaging the sides; of a crystal restedon said wheel; a substan-# tially horizontal arm hingedly mounted on'said bracket and extending over and engaging said crystal, and a weight on said arm for pressing said crystal against said wheel, said means for.

supplying said fluid including a vessel supported above the grinding orpolishing wheel and having an opening through which Carborundum mud or other polishing material may drip.- uponsaid grinding wheel. 1

3. An automatic crystal grinding machine, comprising a container, a grinding or polishing wheel having a flat top and rotatively mounted in said container, means for driving said'grinding wheel, means for supplying grinding or polishing fluid to the top of said wheel, means for draining said fluid from said container, and a plurality of means for engaging and holding crystals against said flat top, each of said latter named means comprising a bracket, mounted on said container and extending over a section of said wheel and having one side extending radially of said wheel, a pair of jaws adjustably mounted grooves formed upon the radial sides. of said on said radially extending side for engaging the sides of a crystal rested on said wheel, a substantially horizontal arm hingedly mounted on said bracketand extending over and engaging said crystal, andla weight on said arm for pressing said crystal against said wheel, said jaws having dovetailed tongues engaging dovetailed brackets.

4. An automatic crystal grinding machine, comprising a. container, a grinding or polishing wheel having a flat. top and rotatively mounted in said container, means for driving said grind ing wheel, means for supplying grinding or pol: ishing fluid to the top of said Wheel, meansv for draining said fluid from said container, and a plurality, of means for; engaging and holding crystals. against said flat top, each. of said latter named means comprising a bracket mounted on said container and extending over a section of said wheeland having one side extending radially oi said wheel, a. pairof jaws adjustably mounted on said radially extending side for engaging the sides of a crystal rested on said wheel, a substantially. horizontal arm hingedlymounted on said bracket and extending over and engaging said crystal, and av weighton said arm for pressing said crystalagainst said wheel, said jaws having dovetailed. tongues. engaging. dovetailed grooves formed upon the radial sides. of said brackets,

and set screws. threadedly engaging the brackets 4 and abuttable against said tongues, for holding the jaws; in selected. positions.

5. An automatic crystal grinding machine, comprisinga container, a, grinding or polishing wheel having a fiat topand rotatively mounted in said; container, means: for driving said grinding wheel, meansfor supplyingv grinding or polishing fluid to the top of said wheel, means for draining said fluid from said container, and a plurality of means for engaging and holding crystals against said flat. top, each of said latter named means comprising a bracket. mounted on=.said container andextending over a section of said wheel and having one side extending radially of= said wheel, a pair; of. jaws adjustably mounted onsaid radially. extending side .forengaging the sides. of a crystal rested onsaid-wheel, a substantially horizontal arm hingedlyi mounted on said bracket and extending over and engaging said crystal, anda weight on said arm for. pressing said crystal against...said wheel, slides. mounted upon said brackets, adjustment. screws for adjusting said slides, and said horizontal arms.- being hingedly connected. with. said slides.v

ANTHONY SPINA. 

